2018 Mercedes-Benz CLA250 Engine Problems
- Complaints
- 6about this part
- Share
- 15%of 41 total for the year
- Median mileage
- 118,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the engine of the 2018 Mercedes-Benz CLA250, 15% of the 41 complaints for this model year. Where a mileage was given, the median is 118,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I am driving around 55K miles in this car, and my check engine light comes up. I head to a local place to get a code check. The guy looks it up and tells me this is pretty much with EVERY Mercedes CLA around that mile point.. So, I look up on reddit and other forums, and it's exactly what he said. Pretty much the PCV valve is faulty and costs around $1800-2500 to fix after 50-60K miles which causes emission problems and other safety concerns if not taken care of. It makes no sense how this is not a recall. …”
NHTSA complaint #11622361, filed 2024-10“The contact owns a 2018 Mercedes-Benz CLA250. The contact stated that coolant was leaking from the engine with the check engine warning light illuminated. The vehicle was taken to an independent mechanic where the mechanic replaced the coolant reservoir cap. Several months later, the warning light re-appeared, and the contact topped off the coolant level and the warning light disappeared. Recently, the check engine warning light illuminated and took the vehicle back to the independent mechanic. …”
NHTSA complaint #11531259, filed 2023-07, 118,000 miles“Corrosion of the fuel system (on a Flex Fuel rated vehicle that had used E85 blend regularly) causing sudden loss of power, misfires, lack of acceleration The vehicle experience sudden loss of power, multiple misfires, and potential damage to the engine. Had the vehicle been on the highway or attempting to merge with traffic this could have resulted in an accident See attached dealer diagnosis and replacement of multiple fuel injectors, fuel pump, and fuel rail. …”
NHTSA complaint #11722825, filed 2026-03Related service bulletins
- 11034064Jun 19, 2026Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline…
- 11018215May 2, 2025Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the SCN coding in the Belt-driven Starter Alternator (BSA) control…
- 11008712Oct 4, 2024Complaint Check engine light on. One of the below fault codes is current in the engine control module (N3/10). P04DB29, P04DB31, P04DB79 Cause Open circuit or high resistance to…
- 10135644Oct 22, 2014Engine starts - but stops again
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2023 | 1 | 17% |
| 2021 | 1 | 14% |
| 2020 | 4 | 20% |
| 2019 | 4 | 17% |
| 2018 | 6 | 15% |
| 2017 | 4 | 14% |
| 2016 | 15 | 22% |
| 2015 | 14 | 23% |
| 2014 | 66 | 37% |
| 2013 | 1 | 11% |
| 2012 | 3 | 43% |
Other parts of the 2018 Mercedes-Benz CLA250
10 complaintsOther or unknown
10 complaintsAir bags
8 complaintsBody and structure
6 complaintsFuel system
3 complaintsSeats
2 complaintsSteering
2 complaintsTransmission and drivetrain
2 complaintsEngine cooling
1 complaintsLane departure
1 complaintsSuspension
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2018 Mercedes-Benz CLA250
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology